There are two projects in my solution currently: a Windows Class Library (targeting .NET Framework 4.6.1) and another class library that targets .NE
You can not use some libraries in PCL projects because it is not built as a PCL and it is not cross platform. Some namespace is unavailable in PCL projects and it is not listed here.
The following assemblies are available within a Portable Class Library project:
•
mscorlib.dll•
System.dll•
System.Core.dll•
System.Xml.dll•
System.ComponentModel.Composition.dll•
System.Net.dll•
System.Runtime.Serialization.dll•
System.ServiceModel.dll•
System.Xml.Serialization.dll•
System.Windows.dll (from Silverlight)
However, not all of these assemblies are supported on all platforms.